Reference key from same array

Question

I'm trying to reference the key/value pair of an item in the same array:

$glossary_args = array(
    'name'          => 'Glossary Terms',
    'singular_name' => 'Glossary Term',
    'add_new'       => 'Add New Term',
    'edit_item'     => 'Edit Term',
    'search_items'  => 'Search'.$glossary_args["name"],
)

Is this even possible? If so, how?

Dupe of stackoverflow.com/questions/10358261/php-self-referencing-array — ernie
– ernie, Commented Aug 29, 2012 at 19:57
Perhaps, but I think that this is a little more specific. In addition to that, I would like to hear opinions on the best way to accomplish this if it is not possible. — Greg Wiley
– Greg Wiley, Commented Aug 29, 2012 at 20:03

Eric · Accepted Answer · 2016-10-17 12:45:57Z

18

You can use the fact that assignment is itself an expression in PHP:

$glossary_args = array(
    'name'          => ($name = 'Glossary Terms'),
    'singular_name' => 'Glossary Term',
    'add_new'       => 'Add New Term',
    'edit_item'     => 'Edit Term',
    'search_items'  => 'Search'.$name
)

edited Oct 17, 2016 at 12:45

answered Aug 29, 2012 at 20:05

Eric

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2 Comments

kiradotee Over a year ago

Wow, I hoped I could do something like: functionName($arr = [ 'message' => 'hello', 'something_else' => $arr['message'] ]); or functionName([ 'message' => 'hello', 'something_else' => $self['message'] ]); but yours does work!

pbarney Over a year ago

Your PHP kung fu is strong.

Abraham · Accepted Answer · 2012-08-29 20:05:07Z

3

You can't do this when you're first defining the array - while you're inside array(), $glossary_args hasn't been created yet. Try this:

$glossary_args = array(
  'name' => 'Glossary Terms',
  'singular_name' => 'Glossary Term',
  'add_new' => 'Add New Term',
  'edit_item' => 'Edit Term'
);
// first we create the rest of $glossary_args, then we set search_items
$glossary_args['search_items'] = 'Search '.$glossary_args["name"];

edited Aug 29, 2012 at 20:05

answered Aug 29, 2012 at 19:57

Abraham

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3 Comments

Greg Wiley Over a year ago

Ok. I'm thinking that I will do the same thing that I did with search to add_new and edit_item. The idea is that I would only have to edit name and singular name and it would change the rest of the array. Would you recommend array_push at that point?

Abraham Over a year ago

array_push can't set array keys, only values. You'd have to set add_new and edit_item the same way as search_items.

ernie Over a year ago

it'd be cleaner to use references . . . see my answer

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